Electric swivel socket



K. KLHMA I ELECTRIC SWIVEL SOCKET Fel.2fs,19z4. -k 1,484,992

Original Filed Jan. 31. 1921 Patented Feb. 26,1924,

@UNITED STATES 1,484,992 PATENT ori-ice l i f KENJIKKIJIMA, or Los ANGELES, CALIFORNIA.

Etncnrnie sWIvEL SOCKET.

y 'i Alipiicatio'n inea January ai, A1921, serial' Noglnunci. Renewed January 24; i924.

To all wkomz'tmay opneemt' i' l *f j K' Be'it known tliatI, KENJI Kramm, a subi jectVo-f theEmperor of Japanresiding in the city and countyofLos Angeles and State of California, havelinvented a new and useful Electric Swivel Socket, `of which the following is a specification.

The present invention relates to electrical appliances and more particularly to provide a swivel joint f for electrical conductors, which will permit the same to be twisted, turned, and handled without becoming tangled, without breaking, vand without interruption of the circuit, the device being especially adapted for use with portable electric apparatus, such as lamps, telephones, motor fans andthe like. c

To these andv other ends, theinvention resides in certain improvements and combina tion of parts all as will be more fully and hereinafter described and pointed out in the appendedy claims.

In the drawings, Figure 1 is a side View of my improved electric swivel socket.

Fig. 2 is a side view of the same, with parts of the qcasing withdrawn partly from the assembled position. Fig. 3 is a plan view of the ring which .retains the casing in assembled form'. Fig. 4 is a side or edge view 'of the retaining ring. Fig. 5 is a perspective view offan inner insulating member. Fig. 6 isa bottom plan view of the contact elements forming the innertelescoping part of the device. Fig. `"iis a top plan view of the contact elements forming the outer telescoping part of the device. Fig. 8 yis a perspective and detail view of the inner contact member. Fig. 9 is a perspective and detail view of the contact member Vwhich co-acts with the inner contact member. Fig. 10 is a transverse and sectional view of the inner telescoping member with the metallic sulating member 28, preferably of porcelain, v

retained by screws 29 Awhich pass through an ed 0f paper. Member 28, has mounted thereon a contact member 31, to whi'chis attached visy mounted within casing member 22, being i the connecting element 32,-r separated from" the paper member 30, by a wax insulatingl element 33. The inner and central contact element 40 is fixed to the connectorelement 34, and binding screws 35 are provided for connecting electrical conductors thereto. An insulating member 36, preferably of paper, is provided.

The outer casing member 21 has mounted therein the insulating block 37, on which are mounted the contact member 38, adapted to cooperate with contact-member 31, and contact member 39, adapted to cooperate with 'contact member 4:0, both contact members 38 and 39 consisting of fingers designed to grasp the' corresponding contact member, and having connectors 32 and 34;, respectively.

It will be seen that this invention provides a swivel joint for electric conductors, and that a constant contact may be retained and all twisting strains on the conductors avoided, and whenassembled, the parts cannot be separated.

That is claimed is:

1,. In an electric swivel socket, the combination with an outer telescoping casing, a lining therefor of insulating material, an inner insulating member relatively fixed to the casing, and two contact members.y constituting, respectively outer and inner con centric and flexible shells completely enclosed within the casing and its lining of insulating material, comprising a plurality of outwardly yielding spring fingers formed with inwardly projecting extremities, of an inner telescopingcasing and lining therefor of insulating material, a second inner .insulating member relatively fixed to the inner casing, two contact members carried by the A'inner insulating member engaging with the yielding fingers of the outer Contact members, an annular flange on the inner casing and disposed within the outer casing; a knurled flange on the inner casing and disposed without the outer. casing, a detachable ring on the outer casing and disposed between the flanges on the inner c asing, and screws securing the detachable ringto the outer casing. I

2. In an electric swivel socket, the combination with an outer telescoping casing, a lining therefor of insulating material, an inner insulating member relatively fixed to the easing, and two contact members consisting of concentric and yieldable fingers, mounted on the insulating member, of an inner telescoping casing, insulating lining therein, an insulating member therein, contact members mounted therein and cooperating With the yieldable fingers, means for connecting eleetric terminals to the contact members, and means for maintaining the telescoping casings in rotatable connection with one another.

3. Telescoping casings axially rotative Y Vthis 31st day of December, 1920.

relative to one another, annular flanges on the inner casing, a ring disposed between the annular flanges, screws securing the ring to the outer casing, contact members insulated from one another and insulated from the inner casing and rotatable With said inner casing, cooperative contact members insulated from one another and insulated from the outer casing and rotatable With said outer casing, and means for connecting electric terminals With said contact members.

In testimony whereof I aix my signature KENJ I KIJ IMA. 

